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тАО09-17-2008 11:17 PM
тАО09-17-2008 11:17 PM
MSA 2012i dual controller failover behaviour
Somewhere I read that a VDisk is "homed" to a specific controller. Our installation includes a single VDisk.
My query is: with 2 controllers, will the MSA failover to the second controller and maintain access to the single VDisk?
Thanks in advance for your help.
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тАО09-29-2008 09:26 AM
тАО09-29-2008 09:26 AM
Re: MSA 2012i dual controller failover behaviour
Another test we did was yank a controller out of the chassis that had a vDisk presented to a host and was the owning controller for the vDisk. Oddly, the vDisk remained presented to the host, which leads me to believe that somehow the system "fools" the host into believing the controller is still available, but the 2nd controller actually takes over. Strange!
Keep in mind we were just playing around with one of these iSCSI SAN's and by no means am I an expert on how the thing works.
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тАО09-29-2008 09:49 AM
тАО09-29-2008 09:49 AM
Re: MSA 2012i dual controller failover behaviour
> the controller is still available
The other controller takes over the IP addresses of the failed controller.
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тАО10-31-2008 02:26 PM
тАО10-31-2008 02:26 PM
Re: MSA 2012i dual controller failover behaviour
Is this documented somewhere?
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тАО11-01-2008 10:48 AM
тАО11-01-2008 10:48 AM
Re: MSA 2012i dual controller failover behaviour
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тАО05-13-2009 02:05 PM
тАО05-13-2009 02:05 PM
Re: MSA 2012i dual controller failover behaviour
I assume the 2 switches and the interfaces they are connected to must be on different subnets, is that correct?
Also I see from page 264 of the document your refefence that if Controller B goes down Controller A will manage the vdisks (probably at a decreased performance). If the SAN switch goes down or if a network cable to Contorller B goes down, or even if a network cable plugged into the server gets unplugged will it also then switch over to the other controller?
If just a network cable from a server's SAN HBA gets unplugged the controller obviously wouldn't take over the IP of the other controller, since other servers are still using it normally.